66256619293453 has 2 divisors, whose sum is σ = 66256619293454. Its totient is φ = 66256619293452.

The previous prime is 66256619293439. The next prime is 66256619293477. The reversal of 66256619293453 is 35439291665266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41933356506409 + 24323262787044 = 6475597^2 + 4931862^2 .

It is a cyclic number.

It is not a de Polignac number, because 66256619293453 - 2⁴¹ = 64057596037901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66256619293493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33128309646726 + 33128309646727.

It is an arithmetic number, because the mean of its divisors is an integer number (33128309646727).

Almost surely, 2^{66256619293453} is an apocalyptic number.

It is an amenable number.

66256619293453 is a deficient number, since it is larger than the sum of its proper divisors (1).

66256619293453 is an equidigital number, since it uses as much as digits as its factorization.

66256619293453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 377913600, while the sum is 67.

The spelling of 66256619293453 in words is "sixty-six trillion, two hundred fifty-six billion, six hundred nineteen million, two hundred ninety-three thousand, four hundred fifty-three".